Question

我有一个源代码（test.cpp），它应该显示从avi文件（逐帧）复制到大图像的三个图像（颜色，灰度和精确），并显示在一个窗口中。我在linux平台上使用带有c ++编译器（gnu）的OpenCV库。

但是我遇到了分段错误（Core dumped）。

核心转储：

GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/ad/Desktop/opencv_exercises/ch4/ex1_b/test...done.

warning: Can't read pathname for load map: Input/output error.
Cannot access memory at address 0x5454505052525555
(gdb) r test.avi
Starting program: /home/ad/Desktop/opencv_exercises/ch4/ex1_b/test test.avi
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff627f831 in memcpy () from /lib/libc.so.6
(gdb) bt
#0  0x00007ffff627f831 in memcpy () from /lib/libc.so.6
#1  0x00007ffff6e5ee42 in cv::Mat::copyTo(cv::Mat&) const ()
   from /usr/lib/libcxcore.so.2.1
#2  0x00007ffff6e629fb in cvCopy () from /usr/lib/libcxcore.so.2.1
#3  0x0000000000400e0a in main (argc=2, argv=0x7fffffffe3a8) at test.cpp:55
(gdb)

test.cpp的第55行是：

...... cvCopy（gray，gray_sub）;

...

程序是（test.cpp），如下所示。是否可以复制三个图像（单个IplImage上的颜色，灰度和canny）？我肯定做错了什么。是否有可能帮助我找出我做错了什么？

#include <cv.h>
#include <highgui.h>
#include <stdio.h>


int main( int argc, char** argv )
{
    IplImage *frame;
    CvCapture *capture = NULL;


    if(( argc < 2 ) || !(capture = cvCreateFileCapture( argv[1] )))
    {
        printf("Failed to open %s\n", argv[1] );
        return -1;
    }

    double f = cvGetCaptureProperty(
        capture,
        CV_CAP_PROP_FRAME_COUNT
        );
    double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);



    CvSize size = cvSize(cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH), cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));
    IplImage *img = NULL;
    double index = 0;
    IplImage *gray = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *canny = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *long_img = cvCreateImage(cvSize(size.width*3, size.height),IPL_DEPTH_8U, 3);
    IplImage *color_sub, *gray_sub, *canny_sub;
    cvNamedWindow("ALLONE", 1);
    int key = 0;

    while( index++ < f)
    {       
            cvGrabFrame(capture);
        img = cvRetrieveFrame(capture);

        color_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        color_sub->origin = long_img->origin;
        color_sub->widthStep = long_img->widthStep;
        color_sub->imageData = long_img->imageData;

        cvCopy(img, color_sub);



        cvConvertImage(img, gray);
        gray_sub = cvCreateImageHeader(size, IPL_DEPTH_8U, 1);
        gray_sub->origin = long_img->origin;
        gray_sub->widthStep = long_img->widthStep;
        gray_sub->imageData = long_img->imageData + size.height * long_img->widthStep + size.width * long_img->nChannels;

        cvCopy(gray, gray_sub);


        cvCanny(gray, canny, 100, 200);
        canny_sub = cvCreateImageHeader(size, IPL_DEPTH_8U, 1);
        canny_sub->origin = long_img->origin;
        canny_sub->widthStep = long_img->widthStep;
        canny_sub->imageData = long_img->imageData + size.height * long_img->widthStep + (size.width * 2) * long_img->nChannels;

        cvCopy(canny, canny_sub);



        cvShowImage("ALLONE", long_img);

        key = cvWaitKey(10);
        if(key == 27) break;
        printf("%d\n", key);
    }




    cvReleaseCapture( &capture );

    return 0;
}

Answer 1

我找到了解决方案。那些对代码感兴趣的人如下：

#include <cv.h>
#include <highgui.h>
#include <stdio.h>


int main( int argc, char** argv )
{
    IplImage *frame;
    CvCapture *capture = NULL;


    if(( argc < 2 ) || !(capture = cvCreateFileCapture( argv[1] )))
    {
        printf("Failed to open %s\n", argv[1] );
        return -1;
    }

    double f = cvGetCaptureProperty(
        capture,
        CV_CAP_PROP_FRAME_COUNT
        );
    double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);



    CvSize size = cvSize(cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH), cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));
    IplImage *img = NULL;
    double index = 0;
    IplImage *gray = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *canny = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *long_img = cvCreateImage(cvSize(size.width*3, size.height),IPL_DEPTH_8U, 3);
    IplImage *color_sub, *gray_sub, *canny_sub;
    cvNamedWindow("ALLONE", 1);
    int key = 0;

    while( index++ < f)
    {       cvGrabFrame(capture);
        img = cvRetrieveFrame(capture);

        color_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        color_sub->origin = long_img->origin;
        color_sub->widthStep = long_img->widthStep;
        color_sub->imageData = long_img->imageData;

        cvCopy(img, color_sub);



        cvCvtColor(img, gray, CV_BGR2GRAY);
        gray_sub = cvCreateImageHeader(size,  long_img->depth,long_img->nChannels);
        gray_sub->origin = long_img->origin;
        gray_sub->widthStep = long_img->widthStep;
        gray_sub->imageData = long_img->imageData  + (size.width * long_img->nChannels);

        cvMerge(gray , gray, gray, NULL, gray_sub);


        cvCanny(gray, canny, 100, 200);
        canny_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        canny_sub->origin = long_img->origin;
        canny_sub->widthStep = long_img->widthStep;
        canny_sub->imageData = long_img->imageData +  ((size.width * 2)  * long_img->nChannels);

        cvMerge(canny , canny, canny, NULL, canny_sub);

        cvShowImage("ALLONE", long_img);

        key = (char) cvWaitKey(1000/fps);
        if(key == 27) break;
        printf("%d\n", key);
    }




    cvReleaseCapture( &capture );

    return 0;
}

将灰度，颜色和精确图像（3）全部复制到一个大的IplImage中：Opencv错误？

1 个答案: